Malicious PDF — malware analysis report

Static analysis result for SHA-256 6882714b632a5e1d…

MALICIOUS

PDF

84.1 KB Created: 2021-02-15 00:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b15c3c3c2473b8d170bf873ee5e3ec0 SHA-1: f5ba2da21a5ddc2f561dbe7d99e4172c1b2df627 SHA-256: 6882714b632a5e1ddfc343657c19323c95dfcf7cc650264f8ba92fbf90aef701
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. A critical heuristic indicates the PDF contains a link to known malicious redirector infrastructure. While the document body is heavily obfuscated, the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wix?keyword=manual+sketchup+2017+pdf+espa%25C3%25B1ol In PDF document text
    • https://risegutu.weebly.com/uploads/1/3/4/2/134265716/7928915.pdfIn PDF document text
    • https://jedifugidu.weebly.com/uploads/1/3/1/3/131382595/7949164d41.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/5580085.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/b5e70b0.pdfIn PDF document text
    • http://takimopunize.22web.org/synonym_for_dotted_line_reporting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobemiko.epizy.com/fofosobibafebisatedegivu.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/background_powerpoint_sejarah.pdfIn PDF document text
    • http://xexobazetozi.epizy.com/glencoe_mathematics_algebra_1_answer_key.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/top_songs_of_all_time.pdfIn PDF document text
    • http://jilagikudi.rf.gd/nkjv_bible_for_mac_free.pdfIn PDF document text
    • http://vekibavekuje.epizy.com/34199363484.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/abrahaminte_santhathikal_malayalam_movie_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/nanixifikuradukofu.pdfIn PDF document text
    • http://lezujepadu.rf.gd/kazasabamunez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 5836 bytes
SHA-256: 54bbceff1be59bd171b5fe3aa13bca67959111c137b2908b5c54a3b27d6bb19f
font_01_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 11664 bytes
SHA-256: 48423e4b9fbf6ab3b44e90b9a897637321bbea35ea4704760ac7cf5832790f33

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